Sorry -- I overlooked this question you asked me.
Liquid Peroxide is used to bleach hair, hence the term `` Bottle-blonde``.
However, [ note the spelling] ` Creme Peroxide` is literally a thick-ish cream , but it still has enough of a viscosity to allow it to ` flow`..... it has a percentage [usually 9 or 12 %] of Peroxide in it...this acts as a catalyst when mixing it with colouring paste, such as Koleston perfect, in order for the colour to ` develop`.
The fact that it is not ` pure`[100%] peroxide means it will not bleach the hair if applied to it..it will have a ` lightening` effect on any colour which has been applied to the hair, so if you went a tadd too dark, by leaving colour mix on too long, you can use it`s [relatively mild] ` bleaching` qualities to lighten the colour again.